#!/usr/bin/env bash
# shellcheck disable=SC1090
# Pi-hole: A black hole for Internet advertisements
# (c) 2017-2018 Pi-hole, LLC (https://pi-hole.net)
# Network-wide ad blocking via your own hardware.
#
# Installs and Updates Pi-hole
#
# This file is copyright under the latest version of the EUPL.
# Please see LICENSE file for your rights under this license.
# pi-hole.net/donate
#
# Install with this command (from your Linux machine):
#
# curl -sSL https://install.pi-hole.net | bash
# -e option instructs bash to immediately exit if any command [1] has a non-zero exit status
# We do not want users to end up with a partially working install, so we exit the script
# instead of continuing the installation with something broken
set -e
######## VARIABLES #########
# For better maintainability, we store as much information that can change in variables
# This allows us to make a change in one place that can propagate to all instances of the variable
# These variables should all be GLOBAL variables, written in CAPS
# Local variables will be in lowercase and will exist only within functions
# It's still a work in progress, so you may see some variance in this guideline until it is complete
# List of supported DNS servers
DNS_SERVERS=$(cat << EOM
Google (ECS);8.8.8.8;8.8.4.4;2001:4860:4860:0:0:0:0:8888;2001:4860:4860:0:0:0:0:8844
OpenDNS (ECS);208.67.222.222;208.67.220.220;2620:119:35::35;2620:119:53::53
Level3;4.2.2.1;4.2.2.2;;
Comodo;8.26.56.26;8.20.247.20;;
DNS.WATCH;84.200.69.80;84.200.70.40;2001:1608:10:25:0:0:1c04:b12f;2001:1608:10:25:0:0:9249:d69b
Quad9 (filtered, DNSSEC);9.9.9.9;149.112.112.112;2620:fe::fe;2620:fe::9
Quad9 (unfiltered, no DNSSEC);9.9.9.10;149.112.112.10;2620:fe::10;2620:fe::fe:10
Quad9 (filtered + ECS);9.9.9.11;149.112.112.11;2620:fe::11;
Cloudflare;1.1.1.1;1.0.0.1;2606:4700:4700::1111;2606:4700:4700::1001
EOM
)
# Location for final installation log storage
installLogLoc=/etc/pihole/install.log
# This is an important file as it contains information specific to the machine it's being installed on
setupVars=/etc/pihole/setupVars.conf
# Pi-hole uses lighttpd as a Web server, and this is the config file for it
# shellcheck disable=SC2034
lighttpdConfig=/etc/lighttpd/lighttpd.conf
# This is a file used for the colorized output
coltable=/opt/pihole/COL_TABLE
# Root of the web server
webroot="/var/www/html"
# We store several other directories and
webInterfaceGitUrl="https://github.com/pi-hole/AdminLTE.git"
webInterfaceDir="${webroot}/admin"
piholeGitUrl="https://github.com/pi-hole/pi-hole.git"
PI_HOLE_LOCAL_REPO="/etc/.pihole"
# These are the names of pi-holes files, stored in an array
PI_HOLE_FILES=(chronometer list piholeDebug piholeLogFlush setupLCD update version gravity uninstall webpage)
# This directory is where the Pi-hole scripts will be installed
PI_HOLE_INSTALL_DIR="/opt/pihole"
PI_HOLE_CONFIG_DIR="/etc/pihole"
PI_HOLE_BIN_DIR="/usr/local/bin"
PI_HOLE_BLOCKPAGE_DIR="${webroot}/pihole"
useUpdateVars=false
adlistFile="/etc/pihole/adlists.list"
# Pi-hole needs an IP address; to begin, these variables are empty since we don't know what the IP is until
# this script can run
IPV4_ADDRESS=""
IPV6_ADDRESS=""
# By default, query logging is enabled and the dashboard is set to be installed
QUERY_LOGGING=true
INSTALL_WEB_INTERFACE=true
PRIVACY_LEVEL=0
if [ -z "${USER}" ]; then
USER="$(id -un)"
fi
# Check if we are running on a real terminal and find the rows and columns
# If there is no real terminal, we will default to 80x24
if [ -t 0 ] ; then
screen_size=$(stty size)
else
screen_size="24 80"
fi
# Set rows variable to contain first number
printf -v rows '%d' "${screen_size%% *}"
# Set columns variable to contain second number
printf -v columns '%d' "${screen_size##* }"
# Divide by two so the dialogs take up half of the screen, which looks nice.
r=$(( rows / 2 ))
c=$(( columns / 2 ))
# Unless the screen is tiny
r=$(( r < 20 ? 20 : r ))
c=$(( c < 70 ? 70 : c ))
######## Undocumented Flags. Shhh ########
# These are undocumented flags; some of which we can use when repairing an installation
# The runUnattended flag is one example of this
skipSpaceCheck=false
reconfigure=false
runUnattended=false
INSTALL_WEB_SERVER=true
# Check arguments for the undocumented flags
for var in "$@"; do
case "$var" in
"--reconfigure" ) reconfigure=true;;
"--i_do_not_follow_recommendations" ) skipSpaceCheck=true;;
"--unattended" ) runUnattended=true;;
"--disable-install-webserver" ) INSTALL_WEB_SERVER=false;;
esac
done
# If the color table file exists,
if [[ -f "${coltable}" ]]; then
# source it
source "${coltable}"
# Otherwise,
else
# Set these values so the installer can still run in color
COL_NC='\e[0m' # No Color
COL_LIGHT_GREEN='\e[1;32m'
COL_LIGHT_RED='\e[1;31m'
TICK="[${COL_LIGHT_GREEN}✓${COL_NC}]"
CROSS="[${COL_LIGHT_RED}✗${COL_NC}]"
INFO="[i]"
# shellcheck disable=SC2034
DONE="${COL_LIGHT_GREEN} done!${COL_NC}"
OVER="\\r\\033[K"
fi
# A simple function that just echoes out our logo in ASCII format
# This lets users know that it is a Pi-hole, LLC product
show_ascii_berry() {
echo -e "
${COL_LIGHT_GREEN}.;;,.
.ccccc:,.
:cccclll:. ..,,
:ccccclll. ;ooodc
'ccll:;ll .oooodc
.;cll.;;looo:.
${COL_LIGHT_RED}.. ','.
.',,,,,,'.
.',,,,,,,,,,.
.',,,,,,,,,,,,....
....''',,,,,,,'.......
......... .... .........
.......... ..........
.......... ..........
......... .... .........
........,,,,,,,'......
....',,,,,,,,,,,,.
.',,,,,,,,,'.
.',,,,,,'.
..'''.${COL_NC}
"
}
is_command() {
# Checks for existence of string passed in as only function argument.
# Exit value of 0 when exists, 1 if not exists. Value is the result
# of the `command` shell built-in call.
local check_command="$1"
command -v "${check_command}" >/dev/null 2>&1
}
# Compatibility
distro_check() {
# If apt-get is installed, then we know it's part of the Debian family
if is_command apt-get ; then
# Set some global variables here
# We don't set them earlier since the family might be Red Hat, so these values would be different
PKG_MANAGER="apt-get"
# A variable to store the command used to update the package cache
UPDATE_PKG_CACHE="${PKG_MANAGER} update"
# An array for something...
PKG_INSTALL=("${PKG_MANAGER}" --yes --no-install-recommends install)
# grep -c will return 1 retVal on 0 matches, block this throwing the set -e with an OR TRUE
PKG_COUNT="${PKG_MANAGER} -s -o Debug::NoLocking=true upgrade | grep -c ^Inst || true"
# Some distros vary slightly so these fixes for dependencies may apply
# on Ubuntu 18.04.1 LTS we need to add the universe repository to gain access to dhcpcd5
APT_SOURCES="/etc/apt/sources.list"
if awk 'BEGIN{a=1;b=0}/bionic main/{a=0}/bionic.*universe/{b=1}END{exit a + b}' ${APT_SOURCES}; then
if ! whiptail --defaultno --title "Dependencies Require Update to Allowed Repositories" --yesno "Would you like to enable 'universe' repository?\\n\\nThis repository is required by the following packages:\\n\\n- dhcpcd5" "${r}" "${c}"; then
printf " %b Aborting installation: dependencies could not be installed.\\n" "${CROSS}"
exit # exit the installer
else
printf " %b Enabling universe package repository for Ubuntu Bionic\\n" "${INFO}"
cp -p ${APT_SOURCES} ${APT_SOURCES}.backup # Backup current repo list
printf " %b Backed up current configuration to %s\\n" "${TICK}" "${APT_SOURCES}.backup"
add-apt-repository universe
printf " %b Enabled %s\\n" "${TICK}" "'universe' repository"
fi
fi
# Debian 7 doesn't have iproute2 so if the dry run install is successful,
if "${PKG_MANAGER}" install --dry-run iproute2 > /dev/null 2>&1; then
# we can install it
iproute_pkg="iproute2"
# Otherwise,
else
# use iproute
iproute_pkg="iproute"
fi
# Check for and determine version number (major and minor) of current php install
if is_command php ; then
printf " %b Existing PHP installation detected : PHP version %s\\n" "${INFO}" "$(php <<< "")"
printf -v phpInsMajor "%d" "$(php <<< "")"
printf -v phpInsMinor "%d" "$(php <<< "")"
# Is installed php version 7.0 or greater
if [ "${phpInsMajor}" -ge 7 ]; then
phpInsNewer=true
fi
fi
# Check if installed php is v 7.0, or newer to determine packages to install
if [[ "$phpInsNewer" != true ]]; then
# Prefer the php metapackage if it's there
if "${PKG_MANAGER}" install --dry-run php > /dev/null 2>&1; then
phpVer="php"
# fall back on the php5 packages
else
phpVer="php5"
fi
else
# Newer php is installed, its common, cgi & sqlite counterparts are deps
phpVer="php$phpInsMajor.$phpInsMinor"
fi
# We also need the correct version for `php-sqlite` (which differs across distros)
if "${PKG_MANAGER}" install --dry-run "${phpVer}-sqlite3" > /dev/null 2>&1; then
phpSqlite="sqlite3"
else
phpSqlite="sqlite"
fi
# Since our install script is so large, we need several other programs to successfully get a machine provisioned
# These programs are stored in an array so they can be looped through later
INSTALLER_DEPS=(dhcpcd5 git "${iproute_pkg}" whiptail)
# Pi-hole itself has several dependencies that also need to be installed
PIHOLE_DEPS=(cron curl dnsutils iputils-ping lsof netcat psmisc sudo unzip wget idn2 sqlite3 libcap2-bin dns-root-data libcap2)
# The Web dashboard has some that also need to be installed
# It's useful to separate the two since our repos are also setup as "Core" code and "Web" code
PIHOLE_WEB_DEPS=(lighttpd "${phpVer}-common" "${phpVer}-cgi" "${phpVer}-${phpSqlite}" "${phpVer}-xml" "php-intl")
# The Web server user,
LIGHTTPD_USER="www-data"
# group,
LIGHTTPD_GROUP="www-data"
# and config file
LIGHTTPD_CFG="lighttpd.conf.debian"
# A function to check...
test_dpkg_lock() {
# An iterator used for counting loop iterations
i=0
# fuser is a program to show which processes use the named files, sockets, or filesystems
# So while the command is true
while fuser /var/lib/dpkg/lock >/dev/null 2>&1 ; do
# Wait half a second
sleep 0.5
# and increase the iterator
((i=i+1))
done
# Always return success, since we only return if there is no
# lock (anymore)
return 0
}
# If apt-get is not found, check for rpm to see if it's a Red Hat family OS
elif is_command rpm ; then
# Then check if dnf or yum is the package manager
if is_command dnf ; then
PKG_MANAGER="dnf"
else
PKG_MANAGER="yum"
fi
# Fedora and family update cache on every PKG_INSTALL call, no need for a separate update.
UPDATE_PKG_CACHE=":"
PKG_INSTALL=("${PKG_MANAGER}" install -y)
PKG_COUNT="${PKG_MANAGER} check-update | egrep '(.i686|.x86|.noarch|.arm|.src)' | wc -l"
INSTALLER_DEPS=(git iproute newt procps-ng which chkconfig)
PIHOLE_DEPS=(bind-utils cronie curl findutils nmap-ncat sudo unzip wget libidn2 psmisc sqlite libcap)
PIHOLE_WEB_DEPS=(lighttpd lighttpd-fastcgi php-common php-cli php-pdo php-xml php-json php-intl)
LIGHTTPD_USER="lighttpd"
LIGHTTPD_GROUP="lighttpd"
LIGHTTPD_CFG="lighttpd.conf.fedora"
# If the host OS is Fedora,
if grep -qiE 'fedora|fedberry' /etc/redhat-release; then
# all required packages should be available by default with the latest fedora release
: # continue
# or if host OS is CentOS,
elif grep -qiE 'centos|scientific' /etc/redhat-release; then
# Pi-Hole currently supports CentOS 7+ with PHP7+
SUPPORTED_CENTOS_VERSION=7
SUPPORTED_CENTOS_PHP_VERSION=7
# Check current CentOS major release version
CURRENT_CENTOS_VERSION=$(grep -oP '(?<= )[0-9]+(?=\.)' /etc/redhat-release)
# Check if CentOS version is supported
if [[ $CURRENT_CENTOS_VERSION -lt $SUPPORTED_CENTOS_VERSION ]]; then
printf " %b CentOS %s is not supported.\\n" "${CROSS}" "${CURRENT_CENTOS_VERSION}"
printf " Please update to CentOS release %s or later.\\n" "${SUPPORTED_CENTOS_VERSION}"
# exit the installer
exit
fi
# php-json is not required on CentOS 7 as it is already compiled into php
# verifiy via `php -m | grep json`
if [[ $CURRENT_CENTOS_VERSION -eq 7 ]]; then
# create a temporary array as arrays are not designed for use as mutable data structures
CENTOS7_PIHOLE_WEB_DEPS=()
for i in "${!PIHOLE_WEB_DEPS[@]}"; do
if [[ ${PIHOLE_WEB_DEPS[i]} != "php-json" ]]; then
CENTOS7_PIHOLE_WEB_DEPS+=( "${PIHOLE_WEB_DEPS[i]}" )
fi
done
# re-assign the clean dependency array back to PIHOLE_WEB_DEPS
PIHOLE_WEB_DEPS=("${CENTOS7_PIHOLE_WEB_DEPS[@]}")
unset CENTOS7_PIHOLE_WEB_DEPS
fi
# CentOS requires the EPEL repository to gain access to Fedora packages
EPEL_PKG="epel-release"
rpm -q ${EPEL_PKG} &> /dev/null || rc=$?
if [[ $rc -ne 0 ]]; then
printf " %b Enabling EPEL package repository (https://fedoraproject.org/wiki/EPEL)\\n" "${INFO}"
"${PKG_INSTALL[@]}" ${EPEL_PKG} &> /dev/null
printf " %b Installed %s\\n" "${TICK}" "${EPEL_PKG}"
fi
# The default php on CentOS 7.x is 5.4 which is EOL
# Check if the version of PHP available via installed repositories is >= to PHP 7
AVAILABLE_PHP_VERSION=$("${PKG_MANAGER}" info php | grep -i version | grep -o '[0-9]\+' | head -1)
if [[ $AVAILABLE_PHP_VERSION -ge $SUPPORTED_CENTOS_PHP_VERSION ]]; then
# Since PHP 7 is available by default, install via default PHP package names
: # do nothing as PHP is current
else
REMI_PKG="remi-release"
REMI_REPO="remi-php72"
rpm -q ${REMI_PKG} &> /dev/null || rc=$?
if [[ $rc -ne 0 ]]; then
# The PHP version available via default repositories is older than version 7
if ! whiptail --defaultno --title "PHP 7 Update (recommended)" --yesno "PHP 7.x is recommended for both security and language features.\\nWould you like to install PHP7 via Remi's RPM repository?\\n\\nSee: https://rpms.remirepo.net for more information" "${r}" "${c}"; then
# User decided to NOT update PHP from REMI, attempt to install the default available PHP version
printf " %b User opt-out of PHP 7 upgrade on CentOS. Deprecated PHP may be in use.\\n" "${INFO}"
: # continue with unsupported php version
else
printf " %b Enabling Remi's RPM repository (https://rpms.remirepo.net)\\n" "${INFO}"
"${PKG_INSTALL[@]}" "https://rpms.remirepo.net/enterprise/${REMI_PKG}-$(rpm -E '%{rhel}').rpm" &> /dev/null
# enable the PHP 7 repository via yum-config-manager (provided by yum-utils)
"${PKG_INSTALL[@]}" "yum-utils" &> /dev/null
yum-config-manager --enable ${REMI_REPO} &> /dev/null
printf " %b Remi's RPM repository has been enabled for PHP7\\n" "${TICK}"
# trigger an install/update of PHP to ensure previous version of PHP is updated from REMI
if "${PKG_INSTALL[@]}" "php-cli" &> /dev/null; then
printf " %b PHP7 installed/updated via Remi's RPM repository\\n" "${TICK}"
else
printf " %b There was a problem updating to PHP7 via Remi's RPM repository\\n" "${CROSS}"
exit 1
fi
fi
fi
fi
else
# Warn user of unsupported version of Fedora or CentOS
if ! whiptail --defaultno --title "Unsupported RPM based distribution" --yesno "Would you like to continue installation on an unsupported RPM based distribution?\\n\\nPlease ensure the following packages have been installed manually:\\n\\n- lighttpd\\n- lighttpd-fastcgi\\n- PHP version 7+" "${r}" "${c}"; then
printf " %b Aborting installation due to unsupported RPM based distribution\\n" "${CROSS}"
exit # exit the installer
else
printf " %b Continuing installation with unsupported RPM based distribution\\n" "${INFO}"
fi
fi
# If neither apt-get or yum/dnf package managers were found
else
# it's not an OS we can support,
printf " %b OS distribution not supported\\n" "${CROSS}"
# so exit the installer
exit
fi
}
# A function for checking if a directory is a git repository
is_repo() {
# Use a named, local variable instead of the vague $1, which is the first argument passed to this function
# These local variables should always be lowercase
local directory="${1}"
# A variable to store the return code
local rc
# If the first argument passed to this function is a directory,
if [[ -d "${directory}" ]]; then
# move into the directory
pushd "${directory}" &> /dev/null || return 1
# Use git to check if the directory is a repo
# git -C is not used here to support git versions older than 1.8.4
git status --short &> /dev/null || rc=$?
# If the command was not successful,
else
# Set a non-zero return code if directory does not exist
rc=1
fi
# Move back into the directory the user started in
popd &> /dev/null || return 1
# Return the code; if one is not set, return 0
return "${rc:-0}"
}
# A function to clone a repo
make_repo() {
# Set named variables for better readability
local directory="${1}"
local remoteRepo="${2}"
# The message to display when this function is running
str="Clone ${remoteRepo} into ${directory}"
# Display the message and use the color table to preface the message with an "info" indicator
printf " %b %s..." "${INFO}" "${str}"
# If the directory exists,
if [[ -d "${directory}" ]]; then
# delete everything in it so git can clone into it
rm -rf "${directory}"
fi
# Clone the repo and return the return code from this command
git clone -q --depth 20 "${remoteRepo}" "${directory}" &> /dev/null || return $?
# Data in the repositories is public anyway so we can make it readable by everyone (+r to keep executable permission if already set by git)
chmod -R a+rX "${directory}"
# Move into the directory that was passed as an argument
pushd "${directory}" &> /dev/null || return 1
# Check current branch. If it is master, then reset to the latest availible tag.
# In case extra commits have been added after tagging/release (i.e in case of metadata updates/README.MD tweaks)
curBranch=$(git rev-parse --abbrev-ref HEAD)
if [[ "${curBranch}" == "master" ]]; then #If we're calling make_repo() then it should always be master, we may not need to check.
git reset --hard "$(git describe --abbrev=0 --tags)" || return $?
fi
# Show a colored message showing it's status
printf "%b %b %s\\n" "${OVER}" "${TICK}" "${str}"
# Move back into the original directory
popd &> /dev/null || return 1
return 0
}
# We need to make sure the repos are up-to-date so we can effectively install Clean out the directory if it exists for git to clone into
update_repo() {
# Use named, local variables
# As you can see, these are the same variable names used in the last function,
# but since they are local, their scope does not go beyond this function
# This helps prevent the wrong value from being assigned if you were to set the variable as a GLOBAL one
local directory="${1}"
local curBranch
# A variable to store the message we want to display;
# Again, it's useful to store these in variables in case we need to reuse or change the message;
# we only need to make one change here
local str="Update repo in ${1}"
# Move into the directory that was passed as an argument
pushd "${directory}" &> /dev/null || return 1
# Let the user know what's happening
printf " %b %s..." "${INFO}" "${str}"
# Stash any local commits as they conflict with our working code
git stash --all --quiet &> /dev/null || true # Okay for stash failure
git clean --quiet --force -d || true # Okay for already clean directory
# Pull the latest commits
git pull --quiet &> /dev/null || return $?
# Check current branch. If it is master, then reset to the latest availible tag.
# In case extra commits have been added after tagging/release (i.e in case of metadata updates/README.MD tweaks)
curBranch=$(git rev-parse --abbrev-ref HEAD)
if [[ "${curBranch}" == "master" ]]; then
git reset --hard "$(git describe --abbrev=0 --tags)" || return $?
fi
# Show a completion message
printf "%b %b %s\\n" "${OVER}" "${TICK}" "${str}"
# Data in the repositories is public anyway so we can make it readable by everyone (+r to keep executable permission if already set by git)
chmod -R a+rX "${directory}"
# Move back into the original directory
popd &> /dev/null || return 1
return 0
}
# A function that combines the functions previously made
getGitFiles() {
# Setup named variables for the git repos
# We need the directory
local directory="${1}"
# as well as the repo URL
local remoteRepo="${2}"
# A local variable containing the message to be displayed
local str="Check for existing repository in ${1}"
# Show the message
printf " %b %s..." "${INFO}" "${str}"
# Check if the directory is a repository
if is_repo "${directory}"; then
# Show that we're checking it
printf "%b %b %s\\n" "${OVER}" "${TICK}" "${str}"
# Update the repo, returning an error message on failure
update_repo "${directory}" || { printf "\\n %b: Could not update local repository. Contact support.%b\\n" "${COL_LIGHT_RED}" "${COL_NC}"; exit 1; }
# If it's not a .git repo,
else
# Show an error
printf "%b %b %s\\n" "${OVER}" "${CROSS}" "${str}"
# Attempt to make the repository, showing an error on failure
make_repo "${directory}" "${remoteRepo}" || { printf "\\n %bError: Could not update local repository. Contact support.%b\\n" "${COL_LIGHT_RED}" "${COL_NC}"; exit 1; }
fi
# echo a blank line
echo ""
# and return success?
return 0
}
# Reset a repo to get rid of any local changed
resetRepo() {
# Use named variables for arguments
local directory="${1}"
# Move into the directory
pushd "${directory}" &> /dev/null || return 1
# Store the message in a variable
str="Resetting repository within ${1}..."
# Show the message
printf " %b %s..." "${INFO}" "${str}"
# Use git to remove the local changes
git reset --hard &> /dev/null || return $?
# Data in the repositories is public anyway so we can make it readable by everyone (+r to keep executable permission if already set by git)
chmod -R a+rX "${directory}"
# And show the status
printf "%b %b %s\\n" "${OVER}" "${TICK}" "${str}"
# Return to where we came from
popd &> /dev/null || return 1
# Returning success anyway?
return 0
}
find_IPv4_information() {
# Detects IPv4 address used for communication to WAN addresses.
# Accepts no arguments, returns no values.
# Named, local variables
local route
local IPv4bare
# Find IP used to route to outside world by checking the the route to Google's public DNS server
route=$(ip route get 8.8.8.8)
# Get just the interface IPv4 address
# shellcheck disable=SC2059,SC2086
# disabled as we intentionally want to split on whitespace and have printf populate
# the variable with just the first field.
printf -v IPv4bare "$(printf ${route#*src })"
# Get the default gateway IPv4 address (the way to reach the Internet)
# shellcheck disable=SC2059,SC2086
printf -v IPv4gw "$(printf ${route#*via })"
if ! valid_ip "${IPv4bare}" ; then
IPv4bare="127.0.0.1"
fi
# Append the CIDR notation to the IP address, if valid_ip fails this should return 127.0.0.1/8
IPV4_ADDRESS=$(ip -oneline -family inet address show | grep "${IPv4bare}/" | awk '{print $4}' | awk 'END {print}')
}
# Get available interfaces that are UP
get_available_interfaces() {
# There may be more than one so it's all stored in a variable
availableInterfaces=$(ip --oneline link show up | grep -v "lo" | awk '{print $2}' | cut -d':' -f1 | cut -d'@' -f1)
}
# A function for displaying the dialogs the user sees when first running the installer
welcomeDialogs() {
# Display the welcome dialog using an appropriately sized window via the calculation conducted earlier in the script
whiptail --msgbox --backtitle "Welcome" --title "Pi-hole automated installer" "\\n\\nThis installer will transform your device into a network-wide ad blocker!" "${r}" "${c}"
# Request that users donate if they enjoy the software since we all work on it in our free time
whiptail --msgbox --backtitle "Plea" --title "Free and open source" "\\n\\nThe Pi-hole is free, but powered by your donations: http://pi-hole.net/donate" "${r}" "${c}"
# Explain the need for a static address
whiptail --msgbox --backtitle "Initiating network interface" --title "Static IP Needed" "\\n\\nThe Pi-hole is a SERVER so it needs a STATIC IP ADDRESS to function properly.
In the next section, you can choose to use your current network settings (DHCP) or to manually edit them." "${r}" "${c}"
}
# We need to make sure there is enough space before installing, so there is a function to check this
verifyFreeDiskSpace() {
# 50MB is the minimum space needed (45MB install (includes web admin bootstrap/jquery libraries etc) + 5MB one day of logs.)
# - Fourdee: Local ensures the variable is only created, and accessible within this function/void. Generally considered a "good" coding practice for non-global variables.
local str="Disk space check"
# Required space in KB
local required_free_kilobytes=51200
# Calculate existing free space on this machine
local existing_free_kilobytes
existing_free_kilobytes=$(df -Pk | grep -m1 '\/$' | awk '{print $4}')
# If the existing space is not an integer,
if ! [[ "${existing_free_kilobytes}" =~ ^([0-9])+$ ]]; then
# show an error that we can't determine the free space
printf " %b %s\\n" "${CROSS}" "${str}"
printf " %b Unknown free disk space! \\n" "${INFO}"
printf " We were unable to determine available free disk space on this system.\\n"
printf " You may override this check, however, it is not recommended.\\n"
printf " The option '%b--i_do_not_follow_recommendations%b' can override this.\\n" "${COL_LIGHT_RED}" "${COL_NC}"
printf " e.g: curl -L https://install.pi-hole.net | bash /dev/stdin %b